Well I started noticing light tapping noises when I was at 24" on bigger bumps or going from an old to newly paved road where there's like an inch of difference of height in the road due to new pavement. But that's going at like +50mph.
Any lower than 23.5" then it'll start smacking/banging on bumps and such.. It's not a pleasant noise, especially if you have friends/family in the car.. They'll be like "wtf was that, did something break ?" Hahaha
Not discouraging you in any way whatsoever, you know I wouldn't, but yeah just letting you know what some consequences you may have to deal with when achieving that low low